Improved lifting-jack



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aient @if JOHN Q. CROSBY, OF NORTHBOROUGH, MASSACHUSETTS.

Letters .Patent No. 84,536, dated December 1, 1868.

IMPROVE!) LIFTING-JACK.

The Schedule referre to in these Letters Patent and making part of thesame.

To all whom tt rmal/1,1 concern Be it known that I, JOHN Q. CROSBY, ofNorthborough7 in the county of WVorcester, and State of Massachusetts,have invented a new and improved Wagon- Jack and I do hereby declarethat the following is a full,

clear, and exact description thereof, which will enable others skilledin the art to make and use the same, reference being had to theaccompanying drawing, forming part of this specication.

This invention relates to improvements in jacks, such as are used forraising the wheels of wagons ofi' the' ground, the object of which is tosimplify the same.

It consists of an improved arrangement of the operating-lever, ashereinafter described.

The drawing 4represents a side elevation of my improved jack,

A represents the vertical support, rising up from the bed B in the usualmanner, andprovided with the brace C, to resist the lateral strain dueto the action of the lever in the rst portion of the movement of theslide D, arranged against the slide of the vertical support, into whichthe said brace is secured.

The slide is provided with a yoke, E, taking around `the upper end ofthe part A, and sliding thereon while maintaining the slide in itsvertical position.

F represents the lever, having its fnlcrum on the axle of the rollers G,and connected, by its i ngular arm, H,

o the lower end of the slide.

The said arm, and a portion of the other of the lever, are birurcated,to admit of the necessary movement of the lever in raising the slide,which would otherwise be obstructed by the post.

The slide D is slotted where thebrace C passes through it, to admit ofits vertical movement, and this arrangement also serves toguide theslide laterally.

When the slide is raised by forcing the lever down into the positionrepresented in red in the drawing, the movable fulcrum will be drawn toa point slightlyT beyond the vertical line of the joint-pin I, as isalso shown in red, when the shoulder between the bifurcated parts of thelever F will strike against the post A, or the lever F will strike thebedB, and maintain it in that position, and causing it to hold the slidein a vertical position, as will be' clearly understood by inspection ofthe drawings.

Having thus desclibed my invention,

I claim as new, and desire to secure by Letters Patent The rollers G, incombination with the lever F, substantially as described for the purposespecied.

The above' specification of my invention signed by me, this 18th day ofSeptember, 1868.

JOHN Q. CROSBY. Witnesses:

SAMUEL CLARK, W. W. CROSBY.

